(silica gel; hexane-EtOAc gradient) to give 6 fractions (H1-H6). Fr. H2 (1.8 g) was purified.
Zhao S, Liao X, Wang T, Flippen-Anderson J, Cook JM. (2003) The.
(chloroform-isopropanol, gradient), and. Develosil ODS-3 (acetonitrile-water, 45 : 55). The activity.
Steffence, J. L. Flippen-Anderson and J. C. Cook,
system a concentration gradient, grad x3, keeping temperature and pressure.
Press 1961. 8. De bewering van Flippen, dat de verlaging van de kritische.
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